CAR ONLY DRIVE IN REVERSE, COULD THERE BE A SIMPLER SOLUTION THAN NEW TRANSAXLE

1996 Lincoln Continental • 140,000 miles

It was driving fine no warning at all. I got 100 yards from driveway and it slipped, then engaged, then nothing since. Will go in reverse but all three gears nothing. I love this car and think it has much time left as I drive it highway 85% of time. But the suddenness makes me think it may be something else. Plenty of fluid. Lil help?